*{
    margin: 0;
    padding: 0;
}
.box{
    width: 825px;
    background-color: #108881;
    margin: auto;
    margin-top: 40px;
    padding: 10px;
    height: 100px;
}
li{
    list-style: none;
    float: left;
    width: 69px;
    height: 100px;
    position: relative;
    margin-right: 20px;
}
img{
    display: block;
}
.big{
    width: 224px;
    height: 100px;
    display: none;
    
}
.small{
    width: 69px;
    height: 100px;
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 10px;
    display: block;
}
ul li.item{
    width: 224px;
}
.item .small{
    display: none;
}
.item .big{
    display: block;
}